LOA × B × D: 166.7m × 31.0m × 12,5m
Gross Tonnage: 22,600tons
Output: 12,600kW, 500rpm × 2 sets
Propeller: Lips 4-blade × 4.7m, CPP × 2 sets,
Expanded area ratio 0.694
Propeller shaft: DIA.480/475mm × 17,780mm
Each controllable pitch propeller of the ship is connected to the main engine through the clutch and the reduction gear.
Tsuneishi Shipbuilding equipped the rotating duct propeller on the 13,600 DWT coal carrier. In a general practice, the rotating duct propeller is installed from an upper part, but in this ship, the duct propeller was installed from a lower side due to the restriction of the superstructures. The principal particulars are as follows:
Lpp × B × D: 133.0m × 24.0m × 12.3m
Main engine: Diesel engine
1323kW × 720 rpm × 2 sets
Propeller: 4-blade × 1950mm × 343rpm × 2 sets
Fixed pitch propeller
Rotating speed: about 60 seconds/180∞
Steering device: steering in individual mode, and steering in joystick mode
By this system equipped on board, the turning performance can be improved, the hull vibration and the engine room space can be reduced. Fig. 6.2 shows the general arrangement of the shafting system of the ship.
Reference
[Atsushi OHMOTO]
7. Auxiliary Machinery and Outfitting Works
In the field of auxiliary machinery & outfitting work in 1999, the developments of the dual refrigerant cycle system using the heat drive pump and the magnetic refrigeration at the temperature of hydrogen liquefaction were carried out. The life improvement of the aluminum alloy impeller for the centrifugal compressor by the modification of forging processes was studied. The mono-screw pump integrated with a motor was developed. The further details of these are as follows.
7.1 Development of Dual Refrigerant Cycle System Using Heat Drive Pump1)
Daikin Industries, Ltd, has developed the dual refrigerant cycle system for the refrigerator without parallel in the rest of the world. The "Next Multi NX/ Easy Multi" series using its system have been produced on a commercial basis as the refrigerator for a building. The conventional multi air conditioner is operating by the direct expansion typed refrigeration cycle in which the refrigerant is compressed and condensed in the external unit, then expanded and evaporated directly in the room unit. In this way, the lubricating oil of the compressor circulates in the room unit with the refrigerant. Therefore to return the lubricating oil to the compressor absolutely, the length, the diameter and the installation method of the pipeline are put restrictions on. Also let us consider that the conventional system using the R 22 is renewed to the system using the new HFC (Hydro Fluoro Carbon) refrigerant. If the existing pipelines are appropriated in this case, the lubricating oil of the new system will mix with the mineral oil remaining in the pipelines. As it is the synthetic oil such as a phyletic ether, it will deteriorate immediately and engender the compressor trouble.
The dual refrigerant cycle system using the heat drive pump has been developed to resolve these problems. Fig.7.1 shows the general outline of its system. As shown in this figure, this system consists of the primary refrigerant circuit and the secondary refrigerant circuit. As both circuits are independent absolutely on the pipelines, all the problems concerning to the remaining oil in the pipelines were resolved. Also, the secondary refrigerant circuit consists of the high-efficiency refrigerant / refrigerant heat exchanger, the refrigerant pump (heat drive pump) as shown in Fig.7.2 and the room unit. There are no mechanical parts which need the lubricating oil. Consequently, the degree of freedom of the pipeline installation has been improved particularly. On the length of the pipeline, the utilizable length became 150m from 100m of the conventional system. When the system is renewed from the conventional R 22 system, it can appropriate the existing pipelines because of not including the compressor oil in the secondary refrigerant circuit.
